#include <stdio.h>
#include <ctype.h>   //为isspace()提供原型
#include <stdbool.h> //为bool、true、false提供定义

#define STOP '|'

int main(void)
{
    char c;                 //读入字符
    char prev;              //读入前一个字符
    long n_chars = 0L;      //统计字符数
    int n_lines = 0;            //行数
    int n_words = 0;            //单词数
    int p_lines = 0;            //不完整的行数
    bool inword = false;    //如果c在单词中，inword为真

    printf("Enter text to be analyzed(| to terminate): \n");
    prev = '\n';            //用于识别完整的行

    while ((c = getchar()) != STOP)
    {
        n_chars++;

        if (c == '\n')
            n_lines++;
        if (!isspace(c) && !inword)
        {
            n_words++;              //统计单词
            inword = true;          //开始一个新的单词
        }
        if (isspace(c) && inword)
            inword = false;         //达到单词末尾

        prev = c;                   //保存字符
    }

    if (prev != '\n')
        p_lines = 1;
    printf("characters = %ld, words = %d, lines = %d, partial lines = %d\n", n_chars, n_words, n_lines, p_lines);

    return 0;
}